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                        自述
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                            <b>1.</b>
                        
                        介绍
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                            <b>1.1.</b>
                        
                        动机
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                            <b>1.2.</b>
                        
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                            <b>1.3.</b>
                        
                        三大原则
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                            <b>1.4.</b>
                        
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                            <b>1.5.</b>
                        
                        生态系统
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                        示例
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                            <b>2.</b>
                        
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                            <b>2.1.</b>
                        
                        Action
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                            <b>2.2.</b>
                        
                        Reducer
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                            <b>2.3.</b>
                        
                        Store
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                            <b>2.4.</b>
                        
                        数据流
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                            <b>2.5.</b>
                        
                        搭配 React
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                            <b>2.6.</b>
                        
                        示例：Todo List
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                            <b>3.</b>
                        
                        高级
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                            <b>3.1.</b>
                        
                        异步 Action
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                            <b>3.2.</b>
                        
                        异步数据流
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                            <b>3.3.</b>
                        
                        Middleware
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                            <b>3.4.</b>
                        
                        搭配 React Router
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                            <b>3.5.</b>
                        
                        示例：Reddit API
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                            <b>3.6.</b>
                        
                        下一步
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                            <b>4.</b>
                        
                        技巧
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                            <b>4.1.</b>
                        
                        迁移到 Redux
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                            <b>4.2.</b>
                        
                        使用对象展开运算符
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                            <b>4.3.</b>
                        
                        减少样板代码
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                            <b>4.4.</b>
                        
                        服务端渲染
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                            <b>4.5.</b>
                        
                        编写测试
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                            <b>4.6.</b>
                        
                        计算衍生数据
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                            <b>4.7.</b>
                        
                        实现撤销重做
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                            <b>4.8.</b>
                        
                        子应用隔离
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                            <b>4.9.</b>
                        
                        组织 Reducer
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                            <b>4.9.1.</b>
                        
                        Reducer 基础概念
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                            <b>4.9.2.</b>
                        
                        Reducer 基础结构
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                            <b>4.9.3.</b>
                        
                        Reducer 逻辑拆分
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                            <b>4.9.4.</b>
                        
                        Reducer 重构示例
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                            <b>4.9.5.</b>
                        
                        `combineReducers` 用法
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                            <b>4.9.6.</b>
                        
                        `combineReducers` 进阶
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                            <b>4.9.7.</b>
                        
                        State 范式化
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                            <b>4.9.8.</b>
                        
                        管理范式化数据
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        <li class="chapter " data-level="4.9.9" data-path="docs/recipes/reducers/ReusingReducerLogic.html">
            
                
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                            <b>4.9.9.</b>
                        
                        Reducer 逻辑复用
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        <li class="chapter " data-level="4.9.10" data-path="docs/recipes/reducers/ImmutableUpdatePatterns.html">
            
                
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                            <b>4.9.10.</b>
                        
                        不可变更新模式
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        <li class="chapter " data-level="4.9.11" data-path="docs/recipes/reducers/InitializingState.html">
            
                
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                            <b>4.9.11.</b>
                        
                        初始化 State
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                            <b>5.</b>
                        
                        常见问题
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                            <b>5.1.</b>
                        
                        综合
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        <li class="chapter " data-level="5.2" data-path="docs/faq/Reducers.html">
            
                
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                            <b>5.2.</b>
                        
                        Reducer
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        <li class="chapter " data-level="5.3" data-path="docs/faq/OrganizingState.html">
            
                
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                            <b>5.3.</b>
                        
                        组织 State
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        <li class="chapter " data-level="5.4" data-path="docs/faq/StoreSetup.html">
            
                
                    <a href="../../../docs/faq/StoreSetup.html">
                
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                            <b>5.4.</b>
                        
                        创建 Store
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        <li class="chapter " data-level="5.5" data-path="docs/faq/Actions.html">
            
                
                    <a href="../../../docs/faq/Actions.html">
                
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                            <b>5.5.</b>
                        
                        Action
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        <li class="chapter " data-level="5.6" data-path="docs/faq/CodeStructure.html">
            
                
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                            <b>5.6.</b>
                        
                        代码结构
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        <li class="chapter " data-level="5.7" data-path="docs/faq/Performance.html">
            
                
                    <a href="../../../docs/faq/Performance.html">
                
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                            <b>5.7.</b>
                        
                        性能
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        <li class="chapter " data-level="5.8" data-path="docs/faq/ReactRedux.html">
            
                
                    <a href="../../../docs/faq/ReactRedux.html">
                
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                            <b>5.8.</b>
                        
                        React Redux
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        <li class="chapter " data-level="5.9" data-path="docs/faq/Miscellaneous.html">
            
                
                    <a href="../../../docs/faq/Miscellaneous.html">
                
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                            <b>5.9.</b>
                        
                        其它
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            </ul>
            
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        <li class="chapter " data-level="6" data-path="docs/Troubleshooting.html">
            
                
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                            <b>6.</b>
                        
                        排错
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        <li class="chapter " data-level="7" data-path="docs/Glossary.html">
            
                
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                            <b>7.</b>
                        
                        词汇表
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        <li class="chapter " data-level="8" data-path="docs/api/index.html">
            
                
                    <a href="../../../docs/api/index.html">
                
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                            <b>8.</b>
                        
                        API 文档
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            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="docs/api/createStore.html">
            
                
                    <a href="../../../docs/api/createStore.html">
                
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                            <b>8.1.</b>
                        
                        createStore
                    </a>
            
            
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        <li class="chapter " data-level="8.2" data-path="docs/api/Store.html">
            
                
                    <a href="../../../docs/api/Store.html">
                
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                            <b>8.2.</b>
                        
                        Store
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        </li>
    
        <li class="chapter " data-level="8.3" data-path="docs/api/combineReducers.html">
            
                
                    <a href="../../../docs/api/combineReducers.html">
                
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                            <b>8.3.</b>
                        
                        combineReducers
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.4" data-path="docs/api/applyMiddleware.html">
            
                
                    <a href="../../../docs/api/applyMiddleware.html">
                
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                            <b>8.4.</b>
                        
                        applyMiddleware
                    </a>
            
            
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        <li class="chapter " data-level="8.5" data-path="docs/api/bindActionCreators.html">
            
                
                    <a href="../../../docs/api/bindActionCreators.html">
                
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                            <b>8.5.</b>
                        
                        bindActionCreators
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.6" data-path="docs/api/compose.html">
            
                
                    <a href="../../../docs/api/compose.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.6.</b>
                        
                        compose
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="docs/react-redux/index.html">
            
                
                    <a href="../../../docs/react-redux/index.html">
                
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                            <b>9.</b>
                        
                        react-redux 文档
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="docs/react-redux/api.html">
            
                
                    <a href="../../../docs/react-redux/api.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        API
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="9.2" data-path="docs/react-redux/troubleshooting.html">
            
                
                    <a href="../../../docs/react-redux/troubleshooting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.2.</b>
                        
                        排错
                    </a>
            
            
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                        <a id="edit-link" href="https://github.com/camsong/redux-in-chinese/tree/master/docs/recipes/reducers/UpdatingNormalizedData.md" class="btn fa fa-edit pull-left">&#xA0;&#xA0;&#x5F00;&#x59CB;&#x7EA0;&#x9519;</a><h1 id="%E7%AE%A1%E7%90%86%E8%8C%83%E5%BC%8F%E5%8C%96%E6%95%B0%E6%8D%AE">&#x7BA1;&#x7406;&#x8303;&#x5F0F;&#x5316;&#x6570;&#x636E;</h1>
<p>&#x5982; <a href="NormalizingStateShape.html">&#x8303;&#x5F0F;&#x5316;&#x6570;&#x636E;</a> &#x7AE0;&#x8282;&#x6240;&#x63D0;&#x53CA;&#x7684;&#xFF0C;&#x6211;&#x4EEC;&#x7ECF;&#x5E38;&#x4F7F;&#x7528; Normaizr &#x5E93;&#x5C06;&#x5D4C;&#x5957;&#x5F0F;&#x6570;&#x636E;&#x8F6C;&#x5316;&#x4E3A;&#x9002;&#x5408;&#x96C6;&#x6210;&#x5230; store &#x4E2D;&#x7684;&#x8303;&#x5F0F;&#x5316;&#x6570;&#x636E;&#x3002;&#x4F46;&#x8FD9;&#x5E76;&#x4E0D;&#x89E3;&#x51B3;&#x9488;&#x5BF9;&#x8303;&#x5F0F;&#x5316;&#x7684;&#x6570;&#x636E;&#x8FDB;&#x4E00;&#x6B65;&#x66F4;&#x65B0;&#x540E;&#x5728;&#x5E94;&#x7528;&#x7684;&#x5176;&#x4ED6;&#x5730;&#x65B9;&#x4F7F;&#x7528;&#x7684;&#x95EE;&#x9898;&#x3002;&#x6839;&#x636E;&#x559C;&#x597D;&#x6709;&#x5F88;&#x591A;&#x79CD;&#x65B9;&#x6CD5;&#x53EF;&#x4F9B;&#x4F7F;&#x7528;&#x3002;&#x4E0B;&#x9762;&#x5C55;&#x793A;&#x4E00;&#x4E2A;&#x50CF;&#x6587;&#x7AE0;&#x6DFB;&#x52A0;&#x8BC4;&#x8BBA;&#x7684;&#x793A;&#x4F8B;&#x3002;</p>
<h2 id="%E6%A0%87%E5%87%86%E6%96%B9%E6%B3%95">&#x6807;&#x51C6;&#x65B9;&#x6CD5;</h2>
<h3 id="%E7%AE%80%E5%8D%95%E5%90%88%E5%B9%B6">&#x7B80;&#x5355;&#x5408;&#x5E76;</h3>
<p>&#x4E00;&#x79CD;&#x65B9;&#x6CD5;&#x662F;&#x5C06; action &#x7684;&#x5185;&#x5BB9;&#x5408;&#x5E76;&#x5230;&#x73B0;&#x6709;&#x7684; state&#x3002;&#x5728;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x5BF9;&#x6570;&#x636E;&#x7684;&#x6DF1;&#x62F7;&#x8D1D;&#xFF08;&#x975E;&#x6D45;&#x62F7;&#x8D1D;&#xFF09;&#x3002;Lodash &#x7684; <code>merge</code> &#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x5E2E;&#x6211;&#x4EEC;&#x5904;&#x7406;&#x8FD9;&#x4E2A;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">import</span> merge from <span class="token string">&quot;lodash/object/merge&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">function</span> <span class="token function">commentsById</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">default</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
           <span class="token keyword">if</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>entities <span class="token operator">&amp;&amp;</span> action<span class="token punctuation">.</span>entities<span class="token punctuation">.</span>comments<span class="token punctuation">)</span> <span class="token punctuation">{</span>
               <span class="token keyword">return</span> <span class="token function">merge</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> state<span class="token punctuation">,</span> action<span class="token punctuation">.</span>entities<span class="token punctuation">.</span>comments<span class="token punctuation">.</span>byId<span class="token punctuation">)</span><span class="token punctuation">;</span>
           <span class="token punctuation">}</span>
           <span class="token keyword">return</span> state<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x8FD9;&#x6837;&#x505A;&#x4F1A;&#x8BA9; reducer &#x4FDD;&#x6301;&#x6700;&#x5C0F;&#x7684;&#x5DE5;&#x4F5C;&#x91CF;&#xFF0C;&#x4F46;&#x9700;&#x8981; action creator &#x5728; action dispatch &#x4E4B;&#x524D;&#x505A;&#x5927;&#x91CF;&#x7684;&#x5DE5;&#x4F5C;&#x6765;&#x5C06;&#x6570;&#x636E;&#x8F6C;&#x5316;&#x6210;&#x6B63;&#x786E;&#x7684;&#x5F62;&#x6001;&#x3002;&#x5728;&#x5220;&#x9664;&#x6570;&#x636E;&#x9879;&#x65F6;&#x8FD9;&#x79CD;&#x65B9;&#x5F0F;&#x4E5F;&#x662F;&#x4E0D;&#x9002;&#x5408;&#x7684;&#x3002;</p>
<h3 id="reducer-%E5%88%87%E7%89%87%E7%BB%84%E5%90%88">reducer &#x5207;&#x7247;&#x7EC4;&#x5408;</h3>
<p>&#x5982;&#x679C;&#x6211;&#x4EEC;&#x6709;&#x4E00;&#x4E2A;&#x7531;&#x5207;&#x7247; reducer &#x7EC4;&#x6210;&#x7684;&#x5D4C;&#x5957;&#x6570;&#x636E;&#xFF0C;&#x6BCF;&#x4E2A;&#x5207;&#x7247; reducer &#x90FD;&#x9700;&#x8981;&#x77E5;&#x9053;&#x5982;&#x4F55;&#x54CD;&#x5E94;&#x8FD9;&#x4E2A; action&#x3002;&#x56E0;&#x4E3A;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x8BA9; action &#x56CA;&#x62EC;&#x6240;&#x6709;&#x76F8;&#x5173;&#x7684;&#x6570;&#x636E;&#x3002;&#x8B6C;&#x5982;&#x66F4;&#x65B0;&#x76F8;&#x5E94;&#x7684; Post &#x5BF9;&#x8C61;&#x9700;&#x8981;&#x751F;&#x6210;&#x4E00;&#x4E2A; comment &#x7684; id&#xFF0C;&#x7136;&#x540E;&#x4F7F;&#x7528; id &#x4F5C;&#x4E3A; key &#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x65B0;&#x7684; comment &#x5BF9;&#x8C61;&#xFF0C;&#x5E76;&#x4E14;&#x8BA9;&#x8FD9;&#x4E2A; comment &#x7684; id &#x5305;&#x62EC;&#x5728;&#x6240;&#x6709;&#x7684; comment id &#x5217;&#x8868;&#x4E2D;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x5982;&#x4F55;&#x7EC4;&#x5408;&#x8FD9;&#x6837;&#x6570;&#x636E;&#x7684;&#x4F8B;&#x5B50;&#xFF1A;</p>
<blockquote>
<p>&#x8BD1;&#x8005;&#x6CE8;&#xFF1A;&#x7ED3;&#x5408;&#x4E0A;&#x7AE0;&#x8282;&#x4E2D;&#x8303;&#x5F0F;&#x5316;&#x4E4B;&#x540E;&#x7684; state &#x9605;&#x8BFB;</p>
</blockquote>
<pre><code class="lang-javascript"><span class="token comment" spellcheck="true">// actions.js</span>
<span class="token keyword">function</span> <span class="token function">addComment</span><span class="token punctuation">(</span>postId<span class="token punctuation">,</span> commentText<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x4E3A;&#x8FD9;&#x4E2A; comment &#x751F;&#x6210;&#x4E00;&#x4E2A;&#x72EC;&#x4E00;&#x65E0;&#x4E8C;&#x7684; ID</span>
    <span class="token keyword">const</span> commentId <span class="token operator">=</span> <span class="token function">generateId</span><span class="token punctuation">(</span><span class="token string">&quot;comment&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">return</span> <span class="token punctuation">{</span>
        type <span class="token punctuation">:</span> <span class="token string">&quot;ADD_COMMENT&quot;</span><span class="token punctuation">,</span>
        payload <span class="token punctuation">:</span> <span class="token punctuation">{</span>
            postId<span class="token punctuation">,</span>
            commentId<span class="token punctuation">,</span>
            commentText
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>


<span class="token comment" spellcheck="true">// reducers/posts.js</span>
<span class="token keyword">function</span> <span class="token function">addComment</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>postId<span class="token punctuation">,</span> commentId<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>

    <span class="token comment" spellcheck="true">// &#x67E5;&#x627E;&#x51FA;&#x76F8;&#x5E94;&#x7684;&#x6587;&#x7AE0;&#xFF0C;&#x7B80;&#x5316;&#x5176;&#x4F59;&#x4EE3;&#x7801;</span>
    <span class="token keyword">const</span> post <span class="token operator">=</span> state<span class="token punctuation">[</span>postId<span class="token punctuation">]</span><span class="token punctuation">;</span>

    <span class="token keyword">return</span> <span class="token punctuation">{</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">,</span>
        <span class="token comment" spellcheck="true">// &#x7528;&#x65B0;&#x7684; comments &#x6570;&#x636E;&#x66F4;&#x65B0; Post &#x5BF9;&#x8C61;</span>
        <span class="token punctuation">[</span>postId<span class="token punctuation">]</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
             <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>post<span class="token punctuation">,</span>
             comments <span class="token punctuation">:</span> post<span class="token punctuation">.</span>comments<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>commentId<span class="token punctuation">)</span>             
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">postsById</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&quot;ADD_COMMENT&quot;</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> <span class="token function">addComment</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">default</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">allPosts</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x7701;&#x7565;&#xFF0C;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x4E2D;&#x4E0D;&#x9700;&#x8981;&#x5B83;</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> postsReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    byId <span class="token punctuation">:</span> postsById<span class="token punctuation">,</span>
    allIds <span class="token punctuation">:</span> allPosts
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


<span class="token comment" spellcheck="true">// reducers/comments.js</span>
<span class="token keyword">function</span> <span class="token function">addCommentEntry</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>commentId<span class="token punctuation">,</span> commentText<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>

    <span class="token comment" spellcheck="true">// &#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x65B0;&#x7684; Comment &#x5BF9;&#x8C61;</span>
    <span class="token keyword">const</span> comment <span class="token operator">=</span> <span class="token punctuation">{</span>id <span class="token punctuation">:</span> commentId<span class="token punctuation">,</span> text <span class="token punctuation">:</span> commentText<span class="token punctuation">}</span><span class="token punctuation">;</span>

    <span class="token comment" spellcheck="true">// &#x5728;&#x67E5;&#x8BE2;&#x8868;&#x4E2D;&#x63D2;&#x5165;&#x65B0;&#x7684; Comment &#x5BF9;&#x8C61;</span>
    <span class="token keyword">return</span> <span class="token punctuation">{</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">,</span>
        <span class="token punctuation">[</span>commentId<span class="token punctuation">]</span> <span class="token punctuation">:</span> comment
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">commentsById</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&quot;ADD_COMMENT&quot;</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> <span class="token function">addCommentEntry</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">default</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>


<span class="token keyword">function</span> <span class="token function">addCommentId</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>commentId<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>
    <span class="token comment" spellcheck="true">// &#x628A;&#x65B0; Comment &#x7684; ID &#x6DFB;&#x52A0;&#x5728; all IDs &#x7684;&#x5217;&#x8868;&#x540E;&#x9762;</span>
    <span class="token keyword">return</span> state<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>commentId<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">allComments</span><span class="token punctuation">(</span>state <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&quot;ADD_COMMENT&quot;</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> <span class="token function">addCommentId</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">default</span> <span class="token punctuation">:</span> <span class="token keyword">return</span> state<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> commentsReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    byId <span class="token punctuation">:</span> commentsById<span class="token punctuation">,</span>
    allIds <span class="token punctuation">:</span> allComments
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x4E4B;&#x6240;&#x6709;&#x6709;&#x70B9;&#x957F;&#xFF0C;&#x662F;&#x56E0;&#x4E3A;&#x5B83;&#x5C55;&#x793A;&#x4E86;&#x4E0D;&#x540C;&#x5207;&#x7247; reducer &#x548C; case reducer &#x662F;&#x5982;&#x4F55;&#x914D;&#x5408;&#x5728;&#x4E00;&#x8D77;&#x4F7F;&#x7528;&#x7684;&#x3002;&#x6CE8;&#x610F;&#x8FD9;&#x91CC;&#x5BF9; &#x201C;&#x59D4;&#x6258;&#x201D; &#x7684;&#x7406;&#x89E3;&#x3002;postById reducer &#x5207;&#x7247;&#x5C06;&#x5DE5;&#x4F5C;&#x59D4;&#x62D6;&#x7ED9; addComment&#xFF0C;addComment &#x5C06;&#x65B0;&#x7684;&#x8BC4;&#x8BBA; id &#x63D2;&#x5165;&#x5230;&#x76F8;&#x5E94;&#x7684;&#x6570;&#x636E;&#x9879;&#x4E2D;&#x3002;&#x540C;&#x65F6; commentsById &#x548C; allComments &#x7684; reducer &#x5207;&#x7247;&#x90FD;&#x6709;&#x81EA;&#x5DF1;&#x7684; case reducer&#xFF0C;&#x4ED6;&#x4EEC;&#x66F4;&#x65B0;&#x8BC4;&#x8BBA;&#x67E5;&#x627E;&#x8868;&#x548C;&#x6240;&#x6709;&#x8BC4;&#x8BBA; id &#x5217;&#x8868;&#x7684;&#x8868;&#x3002;</p>
<h2 id="%E5%85%B6%E4%BB%96%E6%96%B9%E6%B3%95">&#x5176;&#x4ED6;&#x65B9;&#x6CD5;</h2>
<h3 id="%E5%9F%BA%E4%BA%8E%E4%BB%BB%E5%8A%A1%E7%9A%84%E6%9B%B4%E6%96%B0">&#x57FA;&#x4E8E;&#x4EFB;&#x52A1;&#x7684;&#x66F4;&#x65B0;</h3>
<p>reducer &#x4EC5;&#x4EC5;&#x662F;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x56E0;&#x6B64;&#x6709;&#x65E0;&#x6570;&#x79CD;&#x65B9;&#x6CD5;&#x6765;&#x62C6;&#x5206;&#x8FD9;&#x4E2A;&#x903B;&#x8F91;&#x3002;&#x4F7F;&#x7528;&#x5207;&#x7247; reducer &#x662F;&#x6700;&#x5E38;&#x89C1;&#xFF0C;&#x4F46;&#x4E5F;&#x53EF;&#x4EE5;&#x5728;&#x66F4;&#x9762;&#x5411;&#x4EFB;&#x52A1;&#x7684;&#x7ED3;&#x6784;&#x4E2D;&#x7EC4;&#x7EC7;&#x884C;&#x4E3A;&#x3002;&#x7531;&#x4E8E;&#x901A;&#x5E38;&#x4F1A;&#x6D89;&#x53CA;&#x5230;&#x66F4;&#x591A;&#x5D4C;&#x5957;&#x7684;&#x66F4;&#x65B0;&#xFF0C;&#x56E0;&#x6B64;&#x5E38;&#x5E38;&#x4F1A;&#x4F7F;&#x7528; <a href="https://github.com/debitoor/dot-prop-immutable" target="_blank">dot-prop-immutable</a>&#x3001;<a href="https://github.com/mariocasciaro/object-path-immutable" target="_blank">object-path-immutable</a> &#x7B49;&#x5E93;&#x5B9E;&#x73B0;&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x3002;</p>
<pre><code class="lang-javascript"><span class="token keyword">import</span> posts from <span class="token string">&quot;./postsReducer&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> comments from <span class="token string">&quot;./commentsReducer&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> dotProp from <span class="token string">&quot;dot-prop-immutable&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span>combineReducers<span class="token punctuation">}</span> from <span class="token string">&quot;redux&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> reduceReducers from <span class="token string">&quot;reduce-reducers&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> combinedReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    posts<span class="token punctuation">,</span>
    comments
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


<span class="token keyword">function</span> <span class="token function">addComment</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>postId<span class="token punctuation">,</span> commentId<span class="token punctuation">,</span> commentText<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>

    <span class="token comment" spellcheck="true">// State here is the entire combined state</span>
    <span class="token keyword">const</span> updatedWithPostState <span class="token operator">=</span> dotProp<span class="token punctuation">.</span><span class="token keyword">set</span><span class="token punctuation">(</span>
        state<span class="token punctuation">,</span>
        `posts<span class="token punctuation">.</span>byId<span class="token punctuation">.</span>$<span class="token punctuation">{</span>postId<span class="token punctuation">}</span><span class="token punctuation">.</span>comments`<span class="token punctuation">,</span>
        comments <span class="token operator">=</span><span class="token operator">&gt;</span> comments<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>commentId<span class="token punctuation">)</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">const</span> updatedWithCommentsTable <span class="token operator">=</span> dotProp<span class="token punctuation">.</span><span class="token keyword">set</span><span class="token punctuation">(</span>
        updatedWithPostState<span class="token punctuation">,</span>
        `comments<span class="token punctuation">.</span>byId<span class="token punctuation">.</span>$<span class="token punctuation">{</span>commentId<span class="token punctuation">}</span>`<span class="token punctuation">,</span>
        <span class="token punctuation">{</span>id <span class="token punctuation">:</span> commentId<span class="token punctuation">,</span> text <span class="token punctuation">:</span> commentText<span class="token punctuation">}</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">const</span> updatedWithCommentsList <span class="token operator">=</span> dotProp<span class="token punctuation">.</span><span class="token keyword">set</span><span class="token punctuation">(</span>
        updatedWithCommentsTable<span class="token punctuation">,</span>
        `comments<span class="token punctuation">.</span>allIds`<span class="token punctuation">,</span>
        allIds <span class="token operator">=</span><span class="token operator">&gt;</span> allIds<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>commentId<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">return</span> updatedWithCommentsList<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> featureReducers <span class="token operator">=</span> <span class="token function">createReducer</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    ADD_COMMENT <span class="token punctuation">:</span> addComment<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">reduceReducers</span><span class="token punctuation">(</span>
    combinedReducer<span class="token punctuation">,</span>
    featureReducers
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x8BA9; <code>ADD_COMMENT</code> &#x8FD9;&#x4E2A; case &#x8981;&#x5E72;&#x54EA;&#x4E9B;&#x4E8B;&#x66F4;&#x52A0;&#x6E05;&#x695A;&#xFF0C;&#x4F46;&#x9700;&#x8981;&#x66F4;&#x65B0;&#x5D4C;&#x5957;&#x903B;&#x8F91;&#x548C;&#x5BF9;&#x7279;&#x5B9A;&#x72B6;&#x6001;&#x6811;&#x7684;&#x4E86;&#x89E3;&#x3002;&#x6700;&#x540E;&#x8FD9;&#x53D6;&#x51B3;&#x4E8E;&#x4F60;&#x5982;&#x4F55;&#x7EC4;&#x7EC7; reducer &#x903B;&#x8F91;&#xFF0C;&#x6216;&#x8BB8;&#x4F60;&#x6839;&#x672C;&#x4E0D;&#x9700;&#x8981;&#x8FD9;&#x6837;&#x505A;&#x3002;</p>
<h3 id="redux-orm">Redux-ORM</h3>
<p><a href="https://github.com/tommikaikkonen/redux-orm" target="_blank">Redux-ORM</a> &#x5E93;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;&#x975E;&#x5E38;&#x6709;&#x7528;&#x7684;&#x62BD;&#x8C61;&#x5C42;&#xFF0C;&#x7528;&#x4E8E;&#x7BA1;&#x7406; Redux store &#x4E2D;&#x5B58;&#x50A8;&#x7684;&#x8303;&#x5F0F;&#x5316;&#x6570;&#x636E;&#x3002;&#x5B83;&#x5141;&#x8BB8;&#x4F60;&#x58F0;&#x660E; Model &#x7C7B;&#x5E76;&#x4E14;&#x5B9A;&#x4E49;&#x4ED6;&#x4EEC;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;&#x3002;&#x7136;&#x540E;&#x5B83;&#x53EF;&#x4EE5;&#x4E3A;&#x4F60;&#x7684;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x751F;&#x6210;&#x65B0;&#x201C;&#x8868;&#x201D;&#xFF0C;&#x5145;&#x5F53;&#x7528;&#x4E8E;&#x67E5;&#x627E;&#x6570;&#x636E;&#x7684;&#x7279;&#x6B8A;&#x9009;&#x62E9;&#x5668;&#x5DE5;&#x5177;&#xFF0C;&#x5E76;&#x4E14;&#x5BF9;&#x6570;&#x636E;&#x6267;&#x884C;&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x3002;</p>
<p>&#x6709;&#x51E0;&#x79CD;&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x7528; Redux-ORM &#x6267;&#x884C;&#x6570;&#x636E;&#x66F4;&#x65B0;&#x3002;&#x9996;&#x9009;&#xFF0C;Redux-ORM &#x6587;&#x6863;&#x5EFA;&#x8BAE;&#x5728;&#x6BCF;&#x4E2A; Model &#x5B50;&#x7C7B;&#x4E0A;&#x5B9A;&#x4E49; reducer &#x51FD;&#x6570;&#xFF0C;&#x7136;&#x540E;&#x5C06;&#x81EA;&#x52A8;&#x751F;&#x6210;&#x7684;&#x7EC4;&#x5408; reducer &#x51FD;&#x6570;&#x653E;&#x5230; store &#x4E2D;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token comment" spellcheck="true">// models.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span>Model<span class="token punctuation">,</span> many<span class="token punctuation">,</span> Schema<span class="token punctuation">}</span> from <span class="token string">&quot;redux-orm&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">class</span> <span class="token class-name">Post</span> <span class="token keyword">extends</span> <span class="token class-name">Model</span> <span class="token punctuation">{</span>
  <span class="token keyword">static</span> <span class="token keyword">get</span> <span class="token function">fields</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">{</span>
      <span class="token comment" spellcheck="true">// &#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x591A;&#x8FB9;&#x5173;&#x7CFB; - &#x4E00;&#x4E2A; Post &#x53EF;&#x4EE5;&#x6709;&#x591A;&#x4E2A; Comments&#xFF0C;</span>
      <span class="token comment" spellcheck="true">// &#x5B57;&#x6BB5;&#x540D;&#x662F; &#x201C;comments&#x201D;</span>
      comments <span class="token punctuation">:</span> <span class="token function">many</span><span class="token punctuation">(</span><span class="token string">&quot;Comment&quot;</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">static</span> <span class="token function">reducer</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">,</span> Post<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">case</span> <span class="token string">&quot;CREATE_POST&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
        <span class="token comment" spellcheck="true">// &#x6392;&#x961F;&#x521B;&#x5EFA;&#x4E00;&#x4E2A; Post &#x5B9E;&#x4F8B;</span>
        Post<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>payload<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">break</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
      <span class="token keyword">case</span> <span class="token string">&quot;ADD_COMMENT&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>postId<span class="token punctuation">,</span> commentId<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>
        <span class="token comment" spellcheck="true">// &#x6392;&#x961F;&#x589E;&#x52A0;&#x4E00;&#x4E2A; Comment ID &#x548C; Post &#x5B9E;&#x4F8B;&#x7684;&#x8054;&#x7CFB;</span>
        Post<span class="token punctuation">.</span><span class="token function">withId</span><span class="token punctuation">(</span>postId<span class="token punctuation">)</span><span class="token punctuation">.</span>comments<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>commentId<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">break</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token comment" spellcheck="true">// Redux-ORM &#x5C06;&#x5728;&#x8FD4;&#x56DE;&#x540E;&#x81EA;&#x52A8;&#x5E94;&#x7528;&#x6392;&#x961F;&#x7684;&#x66F4;&#x65B0;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
Post<span class="token punctuation">.</span>modelName <span class="token operator">=</span> <span class="token string">&quot;Post&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">class</span> <span class="token class-name">Comment</span> <span class="token keyword">extends</span> <span class="token class-name">Model</span> <span class="token punctuation">{</span>
  <span class="token keyword">static</span> <span class="token keyword">get</span> <span class="token function">fields</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">static</span> <span class="token function">reducer</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">,</span> Comment<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>type<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">case</span> <span class="token string">&quot;ADD_COMMENT&quot;</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
        <span class="token keyword">const</span> <span class="token punctuation">{</span>commentId<span class="token punctuation">,</span> commentText<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>

        <span class="token comment" spellcheck="true">// &#x6392;&#x961F;&#x521B;&#x5EFA;&#x4E00;&#x4E2A; Comment &#x5B9E;&#x4F8B;</span>
        Comment<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>id <span class="token punctuation">:</span> commentId<span class="token punctuation">,</span> text <span class="token punctuation">:</span> commentText<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">break</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>   
    <span class="token punctuation">}</span>

    <span class="token comment" spellcheck="true">// Redux-ORM &#x5C06;&#x5728;&#x8FD4;&#x56DE;&#x540E;&#x81EA;&#x52A8;&#x5E94;&#x7528;&#x6392;&#x961F;&#x7684;&#x66F4;&#x65B0;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
Comment<span class="token punctuation">.</span>modelName <span class="token operator">=</span> <span class="token string">&quot;Comment&quot;</span><span class="token punctuation">;</span>

<span class="token comment" spellcheck="true">// &#x521B;&#x5EFA; Schema &#x5B9E;&#x4F8B;&#xFF0C;&#x7136;&#x540E;&#x548C; Post&#x3001;Comment &#x6570;&#x636E;&#x6A21;&#x578B;&#x6302;&#x94A9;&#x8D77;&#x6765;</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> schema <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Schema</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
schema<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span>Post<span class="token punctuation">,</span> Comment<span class="token punctuation">)</span><span class="token punctuation">;</span>


<span class="token comment" spellcheck="true">// main.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> createStore<span class="token punctuation">,</span> combineReducers <span class="token punctuation">}</span> from <span class="token string">&apos;redux&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span>schema<span class="token punctuation">}</span> from <span class="token string">&quot;./models&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> rootReducer <span class="token operator">=</span> <span class="token function">combineReducers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// &#x63D2;&#x5165; Redux-ORM &#x81EA;&#x52A8;&#x751F;&#x6210;&#x7684; reducer&#xFF0C;&#x8FD9;&#x5C06;</span>
  <span class="token comment" spellcheck="true">// &#x521D;&#x59CB;&#x5316;&#x4E00;&#x4E2A;&#x6570;&#x636E;&#x6A21;&#x578B; &#x201C;&#x8868;&#x201D;&#xFF0C;&#x5E76;&#x4E14;&#x548C;&#x6211;&#x4EEC;&#x5728;</span>
  <span class="token comment" spellcheck="true">// &#x6BCF;&#x4E2A; Model &#x5B50;&#x7C7B;&#x4E2D;&#x5B9A;&#x4E49;&#x7684; reducer &#x903B;&#x8F91;&#x6302;&#x94A9;&#x8D77;&#x6765;</span>
  entities <span class="token punctuation">:</span> schema<span class="token punctuation">.</span><span class="token function">reducer</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment" spellcheck="true">// dispatch &#x4E00;&#x4E2A; action &#x4EE5;&#x521B;&#x5EFA;&#x4E00;&#x4E2A; Post &#x5B9E;&#x4F8B;</span>
store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  type <span class="token punctuation">:</span> <span class="token string">&quot;CREATE_POST&quot;</span><span class="token punctuation">,</span>
  payload <span class="token punctuation">:</span> <span class="token punctuation">{</span>
    id <span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    name <span class="token punctuation">:</span> <span class="token string">&quot;Test Post Please Ignore&quot;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment" spellcheck="true">// dispath &#x4E00;&#x4E2A; action &#x4EE5;&#x521B;&#x5EFA;&#x4E00;&#x4E2A; Comment &#x5B9E;&#x4F8B;&#x4F5C;&#x4E3A;&#x4E0A;&#x4E2A; Post &#x7684;&#x5B50;&#x5143;&#x7D20;</span>
store<span class="token punctuation">.</span><span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  type <span class="token punctuation">:</span> <span class="token string">&quot;ADD_COMMENT&quot;</span><span class="token punctuation">,</span>
  payload <span class="token punctuation">:</span> <span class="token punctuation">{</span>
    postId <span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    commentId <span class="token punctuation">:</span> <span class="token number">123</span><span class="token punctuation">,</span>
    commentText <span class="token punctuation">:</span> <span class="token string">&quot;This is a comment&quot;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Redux-ORM &#x5E93;&#x7EF4;&#x62A4;&#x8981;&#x5E94;&#x7528;&#x7684;&#x5185;&#x90E8;&#x66F4;&#x65B0;&#x961F;&#x5217;&#x3002;&#x8FD9;&#x4E9B;&#x66F4;&#x65B0;&#x662F;&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#xFF0C;&#x8FD9;&#x4E2A;&#x5E93;&#x7B80;&#x5316;&#x4E86;&#x8FD9;&#x4E2A;&#x66F4;&#x65B0;&#x8FC7;&#x7A0B;&#x3002;</p>
<p>&#x4F7F;&#x7528; Redux-ORM &#x7684;&#x53E6;&#x4E00;&#x4E2A;&#x53D8;&#x5316;&#x662F;&#x7528;&#x4E00;&#x4E2A;&#x5355;&#x4E00;&#x7684; case reducer &#x4F5C;&#x4E3A;&#x62BD;&#x8C61;&#x5C42;&#x3002;</p>
<pre><code class="lang-javascript"><span class="token keyword">import</span> <span class="token punctuation">{</span>schema<span class="token punctuation">}</span> from <span class="token string">&quot;./models&quot;</span><span class="token punctuation">;</span>

<span class="token comment" spellcheck="true">// &#x5047;&#x8BBE;&#x8FD9;&#x4E2A; case reducer &#x6B63;&#x5728;&#x6211;&#x4EEC;&#x7684; &#x201C;entities&#x201D; &#x5207;&#x7247; reducer &#x4F7F;&#x7528;&#xFF0C;</span>
<span class="token comment" spellcheck="true">// &#x5E76;&#x4E14;&#x6211;&#x4EEC;&#x5728; Redux-ORM &#x7684; Model &#x5B50;&#x7C7B;&#x4E0A;&#x6CA1;&#x6709;&#x5B9A;&#x4E49; reducer</span>
<span class="token keyword">function</span> <span class="token function">addComment</span><span class="token punctuation">(</span>entitiesState<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> session <span class="token operator">=</span> schema<span class="token punctuation">.</span><span class="token function">from</span><span class="token punctuation">(</span>entitiesState<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>Post<span class="token punctuation">,</span> Comment<span class="token punctuation">}</span> <span class="token operator">=</span> session<span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>payload<span class="token punctuation">}</span> <span class="token operator">=</span> action<span class="token punctuation">;</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>postId<span class="token punctuation">,</span> commentId<span class="token punctuation">,</span> commentText<span class="token punctuation">}</span> <span class="token operator">=</span> payload<span class="token punctuation">;</span>

    <span class="token keyword">const</span> post <span class="token operator">=</span> Post<span class="token punctuation">.</span><span class="token function">withId</span><span class="token punctuation">(</span>postId<span class="token punctuation">)</span><span class="token punctuation">;</span>
    post<span class="token punctuation">.</span>comments<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>commentId<span class="token punctuation">)</span><span class="token punctuation">;</span>

    Comment<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>id <span class="token punctuation">:</span> commentId<span class="token punctuation">,</span> text <span class="token punctuation">:</span> commentText<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">return</span> session<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x603B;&#x4E4B;&#xFF0C;Redux-ORM &#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x7EC4;&#x975E;&#x5E38;&#x6709;&#x7528;&#x7684;&#x62BD;&#x8C61;&#xFF0C;&#x7528;&#x4E8E;&#x5B9A;&#x4E49;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;&#xFF0C;&#x5728;&#x6211;&#x4EEC;&#x7684; state &#x4E2D;&#x521B;&#x5EFA;&#x4E86;&#x4E00;&#x4E2A; &#x201C;&#x8868;&#x201D;&#xFF0C;&#x68C0;&#x7D22;&#x548C;&#x53CD;&#x89C4;&#x5212;&#x5173;&#x7CFB;&#x6570;&#x636E;&#xFF0C;&#x4EE5;&#x53CA;&#x5C06;&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x5E94;&#x7528;&#x4E8E;&#x5173;&#x7CFB;&#x6570;&#x636E;&#x3002;</p>

                    
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